PTPRC and lymphangioma: In total, 1776 candidate CTCs from five LUAD‐LM patients (P1, P2, P4, P6, and P7) were FACS sorted (CD45− and Calcein Blue AM+; Figure 1A; Figure S1) and sequenced, from which 1152 cells with at least 600 covered genes in their transcriptome were included in our analysis (Table 1), and these cells were clustered using the t‐SNE method along with the three normal CSF samples N1‐N3.